When I was new to Intel C++ Complier, I found a Wiki How To written by Gentoo but eventually, I found it more confusing than helpful. I am so glad that I foudn a rewritten version that seems more interesting.
Another good thing about it is that it made Portage compile with icc unless you explicitly told it to
use gcc. This is bad. Far too many packages don't work with icc to use
this behavior. The rewritten guide makes Portage compile only specified packages
with icc and all others with gcc which will save a few headaches in the
long run. It also will give your system the ability to use per-package
CFLAGS for gcc and icc!
If you want to add more suggestions or give some reactions please feel free to do so. If you want to know the link to the rewritten How To, please show your interest by replying here also and I will send you the link.